Watertight watch case



' May 19, 1 970 w, JENNY. I 3,512,354

WATER'I'IGHT WATCH CASE Filed Sept. 24, 1968 INVENTOR Werner A TTORNEYUnited States Patent 3,512,354 WATERTIGHT WATCH CASE Werner Jenny,Badmellstrasse 8, Lengnau, Biel, Switzerland Filed Sept. 24, 1968, Ser.No. 761,918 Claims priority, application Switzerland, Apr. 10, 1968,5,292/ 68 Int. Cl. GMb 37/08 US. (II. 5890 5 Claims ABSTRACT OF THEDISCLOSURE A watertight watch case having a casing over which fits awatch glass with a packing ring therebetween for watertightness, a ringthreaded on the casing to clamp the watch glass over the casing rim, theimprovement in the provision of a first additional packing ring betweenthe clamping ring and the watch glass and a second additional packingring between the clamping ring and the casing, the second additionalring standing above the threads on the clamping ring and the casing, inrespect to the first additional packing ring between the watch glass andthe casing.

The patent invention relates to a watertight watch case, especially fordivers watch.

This watch case is of the type comprising a casing, a watch glass, aclamping ring and a packing ring arranged between the glass and thecasing.

An object of the invention is to prevent infiltration of water upstreamof the packing ring between the watch glass and the casing and at thelevel of the clamping ring.

This object is attained, in a watertight watch case according to theinvention wherein a first tightness means is provided between the watchglass edge and the casing upper rim, by the provision of a secondtightness means to ensure water-tightness between the watch glass andthe clamping rim, a third tightness means to ensure watertightnessbetween the clamping ring and the casing, the second and the thirdtightness means being located to prevent water infiltration into thecasing upstream of the first tightness means.

The appended single figure of drawing is a partial view, incross-section, of one embodiment of the invention constituting a case ofdivers watch.

As illustrated, the case comprises a casing 10, a Watch glass 11 havinga peripheral edge bearing against the upper rim 12 of the casing and aclamping ring 13 having threads meshing with corresponding threadsformed on a flange projecting above and outwardly of rim 12 whereby topress watch glass 11 against rim 12.

A packing ring 14 lodged into a corresponding recess of the casingensures watertightness between the latter and the watch glass.

In order to guarantee an absolute watertightness of the watch case atlow and high pressures, two complementary packing rings 15 and 16 areprovided upstream of packing ring 14, at the level of the clamping ring13. These watertightness packing rings are arranged between the clampingring 13 and the watch glass 11 and the casing respectively. The packingring protects the threaded meshing portions and the packing ring 16prevents any infiltration along the edge of the watch glass in thedirection of the main watertightness packing ring 14.

The watch case besides comprises a device for indicating thedecompression stages, the device being constituted by a rotating sight17 mounted in an annular groove of the casing 10. This sight subjectedto the action of a braking spring 18 is integral with a ring 19. Thelatter is locked into a recess of the sight and carries the necessaryindications for the determination of the decompression stages inrelation to the depth and duration of immersion.

Sight 17 by overlapping the edge of the watch glass 11, the clampingring 13 and the casing 10, gives the watch case a particularly aestheticaspect.

The invention is obviously not limited to the embodiment described andillustrated. Particularly the location of the complementary packingrings 15 and 16 may be modified, the essential being that these jointsare located upstream of the main tightness joint.

What is claimed is:

1. A watertight watch case, especially for divers watch, said casehaving a casing defining a peripheral upper rim, a watch glass having aperipheral edge fitting over said upper rim, a clamping ring,cooperating means on said clamping ring and on said casing to allowpressing of said glass against said casing rim and first tightness meansto ensure watertightness between said watch glass peripheral edge andcasing upper rim, characterized by the provision of (a) a secondtightness means to ensure watertightness between said watch glass andclamping ring;

(b) a third tightness means to ensure watertightness between saidclamping ring and said casing;

(c) said second and third tightness means located to prevent waterinfiltration into said casing upstream of said first means.

2. A watch case as claimed in claim 1, wherein said cooperating meanscomprises a flange projecting above and outwardly of said casing upperrim; meshing threads formed on said flange and on said clamping ring andwherein said third tightness means is located so as to pro tect saidmeshing threads.

3. A watch case as claimed in claim 2, wherein said third tightnessmeans is located outwardly of said meshing threads in relation to saidfirst tightness means.

4. A watch case as claimed in claim 3, wherein said second and thirdtightness means generally normally stand on a common level with respectto said first tightness means.

5. A watch case according to claim 1, including a rotatingsight mountedfor rotation on said casing and carrying indications relative todecompression stages, the said sight mounted to overlap said clampingring.

References Cited UNITED STATES PATENTS 3,261,159 7/ 1966 Simon et al.

FOREIGN PATENTS 337,467 5/ 1959 Switzerland.

423,636 5/1967 Switzerland.

RICHARD B. WILKINSON, Primary Examiner G. H. MILLER, JR., AssistantExaminer

